Ghom f3983e3901 Color matrix defines for filters and identity (#80320) ...

This PR converts the procs `color_matrix_identity`,
`color_matrix_lightness` and `color_matrix_contrast` into
defines/macros. Also adds in defines for common color matrix filters.

I don't like how `color_matrix_identity` is a one-line proc with no arg.
Also these help people identify the sort of color matrix filter is being
used.

2023-12-24 20:14:01 +00:00

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